Freightliner 2008 detroit 60 fault codes?

I have an engine lite on and fault codes-545,137,51D,004 and fail 05 coming up all of a sudden.These are freightliner codes-as opposed to engine codes-can anyone tell me what my problem are? Truck is running ok right now but??
Just got out of shop 3 wks ago over 2 grand in repairs and was good to go.
Any help is appreciated